Storage-battery grid and method of making same



N MJU W i--EULLANW S'immm www mm1 Mm wiE-ul-m Uff MAKING SAME.

M`JPL-ICIVFMN FILED H1509, T919.

l plate it Shall be oo. rant, Valtra.

SAME.

tentata Continuation of application nerial No. 340,789, filed lune 19,i918.

.y No. 343,521. y

To all 'wao/ar may '-oneeru lle it known that We, LAWRENCE J. llnansonand "llt-torni: lil. Homann,'citizens ot the llnited States. resiilinlrin l/lillow .ritrovo and ll'lhiladelphia7 respectively, in the State o'PenneylVania7 have invented Sltorage- Battery Grids and lllethods otltlaking Same, oft' which the followingv in a speriliea-` (lne o-hjeetot our invention ie to provide a. storage battery larid which shall notwarn nor prematurely disintegrate under conditions ol une land which asa emisequenee ohfall have an increased useful lite;-the

"invention eontemplating more particularly a cast inet-al grid whosestructure shall he of uniform density and. character at all pointe, treetrom blow holes and vclose grained so that when embodied in a batteryattacked to a minimum and unitorm extent by during; charging,1 anddieehaige-ing,l ot the hattory.

These obje-ete and other i lvantageoue ends we attain as hereinalter settorth. reference being had to the aeeoumanyingr drawings, in which..

litigare l is an elevation ot' a. storage hattery grid em-hodyingy; ourinvention; and

Fig. is a transverse Section on the awe, rig. i.

lln aeeordanee with our invention the alloy trom ivhioh grids are to bemade is melted in the ordinary nlanner and is east in molde evenlyheated byeuitable means, as tor in stance by electric. heating' unita,so that the surfaces eniragred hy the. metal ot the rattling` aremaintained at the ,Same temperature in hoth partel ot the mold and allparte ot' the arid eaetino are cooled at the same rate duru inn'solidiheation. The .mold temperature in addition to heine; uniform, ismaintained at a, point which will prevent euch, chillingn ot the metalas wmild'ren-dor yuncertain its reaehingr and lilliiloA all parte ot themolds hut is no higher at any point than is auflieient toattain thisend. ln other words, the tempel-aline is below the meltingpoint ot' thealloyu but is high enough to insure the tree flow in the mold ol themolten alloy. Moreover we have :found that the better llowing et themetal, dueto the uniform inold heatP maken it possible to reduce notline Specification oi' Letters Patent.

Serial the eleetrolytic action Patented Mar.. fait., lltllllll. `Thisapplication tiled llenen-ther lli,

only the mold temperature but the pouring; temperature of the metah sothat the tinished product is tree ol blow holes, pores, or other minuteas Well as large eavities and is ot increased density and uniformtentare44M throughout its Structure.

For insuring the above noted Conditions ive preferably employ a. machinesuoli. as; that described and Claimed in the applicaH tion tor lll. tl.Patent ol lllessrs. .Pearson and Holland :t/l'2l.0,l'8l. tiled .lune ll9lltltl wherein the parte of the. mold engaged hy the casting' areuniformly heated by electric heatingw units whieh permit the temperatureto heregulated and maintained. with the utmost accuracy Aand certainty.

We have 'found that lhattery plates hat# ing grids ae abovedeseribed'have greater strength and' will not buckle, warp or disintegrate under ordinary hard condition@l ot use since they are attackedto buta slight extent and what small amount ot electro AGill 'llichemical action does oceur ie uniformly die tributed over the externalsurface ot the grid metal and the. electrolyte .annot penetrate :isheretofore, into the interior etruem ture ot the metal through eavitieaor poresu its this,` applioation contains matter in common with theapplication filed by uo lune Il), llllll, Serial Number 2l0,ll:`l9, itto be treated 'ao a. continuation oit Such earlier application in so taras the common subject matter ie concerned.

lille claim:

l.. it battery plato ,gg-rid lead alloy tasting;` formed ture conditionssuch that subetantially non-porous and homogeneone.

2. battery grid consist-ing ot a casting having,r all parte ol' :its twotaees termed ot" metal cooled at the Same rate dui-inn; solidi eationand nubstantially non-porone.

3. il battery grid consist-ine` ot a coasting formed ot lead alloy eastat a relatively low temperature just eullieient to permit it to till allparte ot an evenly heated mold.

t. The method ot making a. battery grid which consists in melting a leadalloy; and

eonsioting ol a under temperaf its; structure 1e loll casting said alloyat a`relatively low tem-- lllli ing said alloy in the form of a grid;and while itis so heated; allowing tbe metal to woling the grid with thesurfaes of all solidifyand removing the east grid. parts thereofsubjected to a uniform and 7. A battery plate grid consisting of :1controlled temperature .above that of the atlead atlloy eastin formed ata relatively low 5 mosphere. temperature suoi that its structure is sub-15 6. The method of making battery grids stantially non-porous.

which consists in heating to and meintain- In witness whereof We aix om`signatures. ing at the same temperature the two parts of a, grid mold tobe engaged by the molten LAWRENCE J. PEARSON.

l 10 metal; casting molten metal in said mold WALTER E. HOLLAND.

